

At some point, something lead to a mutation that turned curly hair into straight hair, and that seems to have been selected for in populations living in colder climates. But that doesn’t mean it increased chances of survival. Maybe it was just preferred by sexual partners for some reason, which may even have been cultural at that point.
Perhaps the hair change was the result of some other gene expression that was beneficial while the hair change itself was neutral-ish.



Nor is decentralization controversial. And there can be a conversation about making sure it is not actively discouraged.
But economies of scale are real. Does that mean a single power plant for the entire US, continent, world is a good idea? Of course not. Nor is 8.3 billion* individual installations.
* current world population